Electric heater.



c. 0. HA RMUN.

ELECTRIC HEATER.

APPLICATION FILED FEB 28, @916.

Patented Mar. 20, 1917.

' I I 2 SHEETS-SHEET I. r1111 I 8 I r i Y 0. 0. HARMON.

ELECTRlC HEATER.

APPLICATION fILED ran. :8, 19m

Patented Mar. 20, 1917,

2 SHEETS-SHEET 2.

, WM YwmM-z UNITED sT 'rEs PATENT OFFICE.

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TOLEDO, OHIO, ASSIGNOR OF ONE-HALF T FREDERICK B. I

DE-FBEES, OI TOLEDO, OHIO.

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Specification 0! Letters Patent.

Patented Mar. 20, 1917.

Application filed February 28,1916. Serial No. 50,767.

To all whom it may concern: I

Be it known that I, (manner O. HAR- MON, a citizen of the United States of America, residing at Toledo, Lucas county,

utility when incori 1 away of the heater of Fig. 1;

Fig. 3 .is an end elevatlon with parts a broken away of the heater of Fig. 1,

Fig.4is a section of the conductor main 'with'one of the branch conductors mounted lator support; I

Fig. 5 shows the conductor main and branch conductor of Fig. l interenga-gin with a pair of insulator strips, as mounte thereon ready to be engaged with the insu- 80 in the heater; v

Figsfi is a plan view, with parts broken away, of'a double deck. arrangement of the heater elements, a eireular unit'as against;

the" showing of a rectangular single deck $5 vunit in Fig. 1; s

Fig. 7 is a side. elevation with parts broken away ofgthe heater of Fig. 6, showing its -=--m0ji1fiting in a heat retaining-pocket; and v 1 1s a, sectlon of conductorma1n, '1'0v showing a conductor'braneh mounted there-- Figoninterenga'ging with a pair of insulator strips,.this conductorbranch being an elevation of the opposite sidefrom the conductorbrancl-r of Fig,

,Tli e heating'unit comprises the or! embracing-frame,embodying the front 1, the;lrea xanemhera 2, and t e end members searef thes'e.' members-ms:

prises the central channel fand the I ."2 hre' provided. with tongues 7 which may an'nels5 and 6= The side members 1 and between be bent over to lock the'frame in an assembled unit of lig 1t and 'rigid structure.

The upper edge channel-5 serves to interengage with the grid 8 protecting the cenlib tral heating units fromattack as well as furnishing a srpport for vessels or articles being heated. The channel (Sat the lower side carries the grid 9 provided with the legs or feet 10 supporting the heating unit. Disposed in the central channels 4 are imperforate insulating strips 11, .say of mica, of a contour about one-halfthe depth of the channels 4. In the end channels 4, over the strips 11, are p: aced insulation strips 12, and

parallel thereto throughout the extent of the heater are the similar intermediate insuliation strips 1 2.

,The heating unitl may be provided with a,

terminal 13 f1'-( m which may extend the conductorfinain ll midway between a pair of strips 12 from the frame side l to the frame I side 2. At, the frame side 2, the main 14. ,is disposed in the channel lagainst the in-.

sulating strip l1 and'passes through a notch or seat 15 in the intermediate insulation strip 12 and from thence passes back to the frame side 1 between the second insulation strip and a third insulation strip 12. This progressof theeonductor main 14 continues throughout the extent of the unit-and the 111211115 then brought back by the insulated conductor 16, whieh'may be held in position by the inward l'y pressed loops 17 in the side frame 1 in its course back'to' the conductor 'r 17 thete'rr film-113. The mailf conductor 14 has thereubout loops-1 8. of conductor branches, basin 7 the arms 19 with the re"- verse bendv sections 20 configured to enter openings 21 in the insulation strips 12.

'With these smtions 20 engaging the strips 12, the freeer ds 22 of the bran'chconductors are bent into interlocking relation with the insulator strips 12. There is thus formed ,an hiterlock ng engagement between the strips 1-2 and theconduetor main 14,ggiVingrigidity to th restructure and medial support the elements thereof to further 'A1temete opposite arms .19 'ojf ,tl 1e branc es 318 are as shown in Fig ;s. Sand 8'." These branches 18,"

h p r H 19, 20,22, we .heatcondiwtorsnnd 'nccerd-l .protrude through the end members B' and .:ing ly;'notwi1 .hstapding they notinthe- ,by Letters Patent is:

direct circuit of the main 14, cooperate with the electrical conductor 14: to radiate heat therefrom.

The circular unit of Figs. (5 and 7 has the housing frame 23 provided with the upper channel. 5 for the protecting grid 24 and is ."ovided with a pair of ii'ittu'mediale channels l. The housing 23 has the extension 25 from the channel 5 with the embracing portion 26 to engage the side walls 27 of the containing vessel ha ring the bottom 28 with seepage openings 29 thercthrough. This resse 27, 528, may have the insulation packing 30 si'urroumling the housing 23 to retain the heat in the h'ating unit, while over the openings 29 in. the bottom ma he dis posed an insulating fabric 31, say of sheet asbestos, which will resist the passage of: heat from the unit and still allow the Seep-- age of liquids spill l'roin cooking to pass through the openings 2th The intense heat of the unit serves to dry and harden other .natcrial so that the device may be readily cleaned by shakingin reverse position.

The tcrn'iinal 3'. has the insulated conductor 353 extending to the. main 3+ sustained by heat radiation lu'anc-u-s or conductors 18, with arms 1!), alternately staggered in en gagement with insulating strips 12. This main 34 passes to and fro between pairs of insulating strips in the circular unit in a similar manner to the main 1-Zl in the rectangular unit. This man Ir-tis returned by the insulated conductor 515 to the conductor 36. From the conductor 3 extends the insulate-d conductor 5)? to the second or lower deck of the heat radia on elements where it communii'tates with the conductor niain 38 extending similar to the conductor main 34. but at right angles thereto and thcrebclow between pairs of insulating strips 12, the irite mediate' strips being parallel to each other and at right angles to the superposed strips 12 in the upper deck of this heating unit. This conductor main 38 is returned by the insulated lead .39 to the conductor 40.

By controlling switches so that electric current is passed from conductor 33 to con ductor 36,-only the upper deck of the heating unit is in service. \Vith the circuit closed from the conductor 33 to the conductor 40, each deck of the heating unit is in service. It is accordingly possible to get two intensities of heat very readily from this compact, light and rigid construction.

The interlocking staggered disposalof the laterally extending arms from the heat eonduetor mains permits of a light weight, long life, stifi construction, with uniform radiation' for heat on a most efiicient basis.

\Vhat is claimed and it is-desired to secure 1. An electric heater comprising a straight section of electric conductor, sustalnlng means therefor including intermed ate ts length transverse dead end heat radiation members, and insulation supporting means for the sustaining means.

2-. An electric heater com nrising an electric conductor forming para lel straight sec tions, insulation stri )S )etwcen the straight sections of the coin uctor, and heat radiation members engaging the strips and conducto' along the straight sections.

An electric heater comprising a continuous electric conductor forming parallel straight sections intermediate its extent, insulation strips unifor. ily spaced between the straight sections, and wire anchors along the straight sections each interlocking with a straight section and two insulation strips.

-l. An electric heater housing comprising a sheet metal member provided with a flange along one edge thereof, a groove parallel therewith, an insulation strip carried by the groove, heat radiation means mounted by the insulation strips, and an electric conductor supported by the heat radiation means.

5. .\n electric hcater comprising a sheet metal housing provided with an endless inwardly opening groove, and a grid carried by the groove, said housing having a second groove spaced troni the lirst groove and electric heater means carried by the sec nd groove. parallel with the grid.

3. An electric heater com 'irising a sheet metal housing providing opposing groove means and extending thcrebetween parallel insulation strips carried by the groove means. i

7. An electric heater comprising a sheet metal housing providing opposinggroove means, parallel perforate insulation strips carried by the groove means, and heat radiation means anchored in the perforations of the parallel insulation strips for still'ening the strips.

8. An electric heater comprising a sheet metal housing providing opposing groove means, parallel insulation strips carried by the groove means, heat radiation means an chored in the parallel insulation'strips for stiffening thestrips, and an electric conductor stayed by said radiation means for rigid fixed extent between. the parallel insulation strips. 1

9. An electric heater housing comprising opposing groove means, parallel insulation strips carried by the groove means, heat mdiation means anchored in the parallel insulation strips, and an electric cm du'ctorv stayed by said radiation means and interlocked by said radiation means with the in sulation strips for combined rigidity support.

10. A straight electric conductor section,

a'heat radiation wire embracing said conductor-section and extending radially there-' from, and insulation strips parallel wlththe conductor wires and forming terminal'an- 13c chors for the heat radiation means whereby the electric conductivity is confined t0 the electric conductor while the heat radiation is dissipated from said conductor by the ru- 5 diation means, i 11. An electric heater comprising a Inain electrical conductor, transverse supporting wires having dead terminals and supporting means engaging said deac'. terminals to thereby anchor the main electrical conductor for free heat dissemination from said electrical conductor and the trar sverse supporting wires.

- In witness whereof I aflix my signature,

CLARENCE 'O HARMON. 

